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Goodwill and Purchased Intangible Assets - Schedule of Acquired Intangibles (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2013
Reseller & customer relationships [Member]
Dec. 31, 2012
Reseller & customer relationships [Member]
Sep. 30, 2013
Intellectual property [Member]
Dec. 31, 2012
Intellectual property [Member]
Sep. 30, 2013
Tradenames [Member]
Dec. 31, 2012
Tradenames [Member]
Sep. 30, 2013
Non-compete arrangements [Member]
Dec. 31, 2012
Non-compete arrangements [Member]
Sep. 30, 2013
Minimum [Member]
Reseller & customer relationships [Member]
Sep. 30, 2013
Minimum [Member]
Intellectual property [Member]
Sep. 30, 2013
Minimum [Member]
Tradenames [Member]
Sep. 30, 2013
Minimum [Member]
Non-compete arrangements [Member]
Sep. 30, 2013
Maximum [Member]
Reseller & customer relationships [Member]
Sep. 30, 2013
Maximum [Member]
Intellectual property [Member]
Sep. 30, 2013
Maximum [Member]
Tradenames [Member]
Sep. 30, 2013
Maximum [Member]
Non-compete arrangements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]                                    
Amortization period (in years)                     1 year 2 years 4 years 2 years 20 years 7 years 9 years 5 years
Accumulated Amortization $ (161) $ (112) $ (32) $ (17) $ (108) $ (80) $ (13) $ (8) $ (8) $ (7)                
Finite-Lived Intangible Assets, Gross $ 635 $ 416 $ 312 $ 179 $ 256 $ 180 $ 59 $ 49 $ 8 $ 8